We have them around here during the summer. I'm used to them being fairly small birds. Well recently I've been seeing them about the size of a robin. At first I thought maybe they were blue grosbeaks, but I'm thinking they are just larger indigo buntings. Both of them have those whitish lower bills. Any clues you use to figure out which one they are? They are pretty good at staying well hiden, so I haven't been able to spend much time looking at them.